archive.is is poisoning results to users of Cloudflare DNS again. You can look up its IP (via e.g. 8.8.8.8) and hardcode it locally for their domains to fix it.
I was wondering the same thing, my router was set to cloudflair and archive would only work when on mobile... wondered why, thanks for the troubleshooting.
They require EDNS client subnet which is not supported by Cloudflare. Cloudflare's decision not to support it and the resultant breakage are mentioned in the Wikipedia article.
Archive.is requests EDNS information about the subnet that your system is on. Cloudflare doesn't pass this information along since it can be used to determine your location in part. So when archive.is doesn't get the subnet info, it sends bogus dns results back and you get that error. See https://jarv.is/notes/cloudflare-dns-archive-is-blocked/ for all the details.
